<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		<!-- 数据代理,通过一个对象代理对另一个对象中属性的操作(读/写) -->
		<script>
			let obj1 = {x:200}
			let obj2 = {y:400}
			
			Object.defineProperty(obj2,'x',{
				get(){
					return obj1.x
				},
				set(number){
					obj1.x = number
				}
			})
		</script>
	</body>
</html>